Auger-bit.



J; T. PUGH.

AUGBR BIT. APPLIOAIION FILED MAY 20, 1910.

967,055; Patented Aug. 9, 1910.

UN TED sm'rns PATENT ornicn JOB r. PUGH, or PHILADELPHIA, PENNSYLVANIA.

AUGER-BIT.

Specification of Letters Patent.

Patented Aug. 9, 1910.

Application filed May 20, 1910. Serial No. 562,509.

To all whom it may concern:

Be it known that I,J OB T. PUGI-I, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain gouge removes the material within the circle from the center toward the periphery.

In the accompanying drawing :Figure 1, is a side View of my improved auger bit; Fig. 2, is an inverted plan view of Fig. 1; Figs. 3, 4 and 5, are sectional views showing the different steps in making the first cut with the bit; and Figs. 6, 7 and 8,are plan views of Figs. 3, 4 and 5,respectively.

A is the auger bit having spirals made in the usual manner, a is the point, tapered and screw threaded as shown, and b is the scribing cutter which is located at the end of one of the spirals and the point at the ex treme outer edge of this cutter makes a circular cut in the Wood, which prevents chipping of the walls of the hole to be cut. This cutter is connected by a blunt section b which acts as a guide for the chips andis not provided with a cutting edge; the cutting being done by a gouge cutter. c which is made as shown, so that the part of the gouge near the center of the bit is substantially on the line w-a2 drawn through the point of the cutter I), while the rounded portion 0" of the gouge cutter is above the line, as indicated.

The bit made in accordance with my, in-

vention first makes a score by the cutter b and makes a circular depression with the part of the gouge cutter c nearest the center, as illustrated in Fig. 3, and as the bit continues to penetrate the wood the gouge cuts more of a depression, as illustrated in Fig.

4c, and, as illustrated in Fi .5, the gouge then cuts the full diameter 0 the depression left standing within the circular cut made by the cutter Z).

It will be seen that a cutter made in accordance with my invention canbe readily formed, that there is only one cutting edge, and a cutting point. There no chisel which is liable to split the wood and conse quently the hole inthe most delicate wood can be bored without Iclaim: 1. An auger bit having two spirals, a screw point,a cutting point at the outer end of one of the spirals, and a gouge cutter at chipping or splitting.

the end of the other spiral, said gouge cutter extending from the center bit to the outer edge. 2. An

auger bit having two spirals, a center point, a cutter at the outer edge ofone of a the spirals, and a gouge cutter at the base of the other spiral, the inner portion of the gouge cutter being on a line with the point at the outer edge of the other spiral.

3. An auger bit having two spirals, and a screwthreaded center point, one of the spi' rals terminating in a blunt end and having a scoring point at the extreme outer edge, the other spiral terminating in a gouge cutter, the inner portion of the gouge cutter being on a line with the scoring point, the outer portion of the gouge cutter being above the line so that an annular out will befmade in the material and a concaved1 cut will be made in the materialwithin the annular cut, the. central out being extended as the bit enters the material.

In testimony whereof, I have signed my name to this'specification, in the presence of two subscribing witnesses.

. JOB T. PUGH. Witnesses:

. WM. E. SI-IUPE,

Win. A. BARR. 

